Recorder and indicator



0 1 4 0 Oct 25 927 H M. BROWN RECORDER AND INDICATOR Filed June 29, 1922 2 Sheets-Sheet 1 YHUF I 4 H. M. BROWN RECORDER AND INDICATOR 2 Sheets$heet 2 Filed June 29, 1922 mcnJZOW- .5 raw/w.

Patented Oct. 25, 1927.

A .nnconnER Ann INDICATOR, 3 Y

I a lication medmeaa, 192:2.- seemin $71,656. a

This invention relates to improvements in indicating and recording apparatus of the type" disclosed in my co-pending -application, Serial Number 366,476, the object of' the 5 present invention beingto provide nstruments of this type'with means compensating automatically for inequalities in the" indications of the instrument due to temperature changes. p V v p Another object of the invention isto pr o 'vide means compensating for difference 1n temperature existi' g at opposite sides'of the instrument. v Q

A further object of the invention to make the instrument more compact. i In the attached drawings: g Figure 1, is a side elevation of an indicator made in accordance with my invention, with a portion of the'side of the casing removed; Fig. 2,'is a plan view of theinstru nent, Fig. 3, is a vertical section 011 the line 3 3,

I ig. 4, is a vertical section on the line Fig.1; m

Fig. 5, is a vertical section on the l1ne 5.-5,

Fig. 1, showing a detailof thefmechanism ofthe indicator and recorder;

I Fig. 6, is a fragmentary frontview portion ofthe mechanism shown-1n Fig. 5,]

p L57 .2 ,I Fig. 7, is a fragmentary plan V ew of that portion of the mechanism shown in Fig, 5

lVith reference toth e drawings, the appa ratus in the present instance compr1sesasubstantially rectangular casing 1 having' atthe top and centrally of the main portion of the casing and extending laterally thereacross a manifold 2, from which extends a pipe3 which communicates Withan aspirator fl: of ,well known construction. The aspirator may be operated either by air, steain'or Water, for a purposeto be described hereinafter. i I A:

f The interior of the "main portion oft the casing 1 is divided into three longitudinal chambers 5,6 and'7, by two laterally movable 1 partitions 8 and'9, saidpartitions beingsuspended atthetop' from flanges 10, l O,proecting inwardlyfrom th'etopiwall of'jthe casing, and underneath the manifold2 from .-a pair of cross plates 11, 11, the lOWQI p QI tions of which constitute a continuation of the said flanges 10. The flanges 10are continuous around the inside of the casing except where broken the manifold 2, extendingdown each of the side wallsfand across .ing'practicallyfjair-tight. if i 8 an d 9 are secured to these lugs overtheir entire length. Atithetop of thefcasing the partitions are suspended; by means, of a flexuie bottbiiioffers'16asi1igaad1the artitibns 'ible and air-tight material and'are connected tofthesides and bottom o fq-the casingiby a thin flexible fabric or ;thin" rubberfthus 'al l lowing] the partitionsfor' diaphragms to wing' laterally without, any appreciable frictiomfsai d partitions at the same time b e- J Mql l ted n one end 1515 each oif'ai' otter", f

compartments 5 and7 fand heldin a vertical 7 t 0' y to tlie endjw alhof thecasin gis a [30st 13, in v the present. instance: in the. form of a I I-bar', which posts arepreferably of iron. S us-'. pended. from a bracket lat the top of each of the posts 13. and supported in'thebra cket byan adjustable jnutl'5gisj a rod-16 ofzinc V .or some metal. or, material vvith 'a consider} ably higher coefiic'ient of expansion' than iron or the material of which the post .13 is made. 5 The] bar 1.6,. attaches at the {bottomof" the casingto alever 17; whichfisfpivota'lly sup- POTted, nearllhelovver end' of the bar 16in a suitable bracket 18 attachedto the lower end of the? post Aspring: -9: is attached; to the outerend of the lever"l 7 andlto the' wall 1 Qof thecasingfl,jand'tends to retain the free end of the'lever in .1 leVi ied position. ,On 1

position by. means ofbrackets '12,' l12," secured the leverfl7 'isabeari'ngelement 20 whichis I adapted to .bejoccupied by the l ower end of uprightrod QLvt'hich-is guided latthejtop in the top wall of the 'casingfandv which is" 'operatively connected by means 'of an'arm 22 tothat diaphragm which consti'tutes the i and that" end" offthej arm which". attaches "to the vpartition is slidablyattached to a vertical stapIeZB 'projecting froinithelower 1-00 t 1 end of the partition, this 'arr angem'e'ntprm vidin for; a vertical movement of the rod 22 for apurpose' to bedescribed hereinafter.

A the p; a' h il fi c b s 21 i a lateral arm 24,, these arms being respectively,

adapted to occupy] a longitudinal slot 25 in one of a pairof arms 26fpivotally"mounted on a fixed/shaft- 27 suitablysupportedi at 28', "28, atfthetop of the casing 1. Also free'tooscih late jonfthe. shaft 27 3s 29 vvhich has loosely mounted, thereon a: crossbar 30, the

opposite"ends'ofjwhichprojeet through open e s a th s are 2 the-i 1r a' present instance constituting. the pointer arm of an indicating and recording instrument of well known construction, and including a dial plate 31 which is continuously rotated on a shaft 32 through predetermined units or periods of time.

Extending through the side of the casing 1 and into the bottom-of each of the chambers 5, 6 and 7, are pipes 33, 34 and 35, respectively, said pipes preferably being perforatedin that portion projecting into the chamber, as shownin Fig. 1. r

i In employing this device for determining the relative amounts ofCO in-fiue gases of furnaces' or boilers, for which purpose the instrument i's primarily intended, the pipe 34 is connected with a line tapped from the flue at a favorable point, .the pipes 33 and merely constituting a means for establishing communication between the outer air and the chambers-5 and 7 respectively, and for obtaining a more orfless even distribution lof the air in thechambers as it enters.

By'means of the aspirator'fle, a mild suction is placed upon the interior of the manifold.

2 ofthe casing, which creates a circulation of air through the two outer chambers and 7 and of the fluegases through the inner chamber G, the circulation in all thecham- Ibers being substantially uniform by reason of the common aspirator.

CO, inthe flue gases. The diaphragms'may As clearly setiforth in my afore-saidcm pending" application, the difference in the densities between the air and'the flue gases causes a diiferen'cei of pressure in the chamberswith a resulting movement of the partitionsor diaphragms, the extent of move? mentpf the "latter from the normal position assumed 'inthe present instance by gravity affording an indication of the amount of be Weighted to afford any resistance to lat- V feral 'displacement'that may be required for purposes of proper calibration.

It has been found, however, that there occurs a diiferen'c'e in the readings of the (instrument at varying temperatures even though the other conditions and the CO content is constant. At 32 F. the diflerence in weight per cubic foot of gases containing 12% (30 and of air is approximately 4/1000 ofa pound,while at 72 F; the diiference' isapproximately 37/10000 of a pound, and

at 1112 11 is 35/10000 of a pound. It, therefore, becomesfevident that the diiference in the-weight of the gas as compared with the 'weight ofthe air becomes less as the temperature increases, but that the differ ence is not directlyfproportional to the temperature. Y 5 QTocompensate for the decrease in the difference of the weights of the air and flue A gasesfI employ the aforedescribed .mechanism, consisting ofthe' Zinc rods 12 supported f on the iron post 13. As the air ipassesinto the chambers 5 "and 7, its temperature will be quickly passed to the rod 16 and to the post 13, increase 1n the temperature of the incoming air being immediately followed by a relatively large expansion of the rod 16 as compared with the expansion of the post 13; the lengthening of the rod causing an elevation of the outer free end of the lever 17, the spring 19 assistling this elevation, and a resulting elevation of the rod 21. The rod 21in elevating car'- ries with it the arm 22, which connects it to the diaphragm, such vertical movement of the rod 22 being permitted by reason of the T aforedescribed staple connection between the arnrandthe diaphragm.

As the'rod 21 is elevated, it also elevates the arm 24 at the top, causing it to move'up- "wardly in the slot 25, and decreasing the distance of the said arm 24 from the shaft 27 upon which the arms26, 26, are mounted.

By reason of the approach of the arms to the shaft '27, rotational movement of the shaft 21 istransmitted in increased ratioto' the pointer 29, which will accordingly traverse the face of the dial plate 31 to greater extent than previously'under the same oscillation of the rod 21. It will be apparent,

i'ied by the dial plate 31, as shown in Fig.

it will be apparent that at the zero readmg on the chart any rise or fall of the arm.

29 will have no effect upon the zero point onv thechart.

"As before mentioned, the difference in weight of the gases and air due'to ten'i'perature changes is not proportionate to the temperature change, and to correct this irregularity, the arms 26 are bent or curved, as shown in Fig. 5. As indicating the operation of the device, I have in Fig. 6 shown in dotted lines the pointer arm 29 in the position which it will occupy when indicating good furnace performance.

It may occur when this instrument is placed in service that one side is exposed to a higher temperature than the other, as by reason of heat radiating from steam pipes, the side wall of a boiler orthe like. For proper operation of this instrument, the gases and air passing through-should be about thesame temperature, min the absence ofthis 'condi ti on, be provided withsome [compensating arrangement. To provide for this, I have, as previously described, PI'Of vided the casing with threechambers and a pair of swinging partitions, the air being drawn in through the two outer chambers and the fiue' gases through the inner chamlilo llU

llf)

her, 3 The column of flue gases being heavier than the columns of air, will dispose the swinging partitions laterally towards the outer sides of the casing.

As illustrating the operation'ofthe in'-' strument under vuneven temperatures, 'we

- will describe what will take place wl entlie instrument is indicating a zero reading,

meaning that air or gases of uniform density arepassing through all three-chambers; We will assume, for example, that one I the instrument is exposed to a source of heat,

the temperature on that side of the instrument accordingly being elevated and there developing a progressive drop offltemperature through theinstrument to the opposite side. The air in the outer chamber on that side of the casing exposed tothe heat will become heated and less dense than theair in the middle chamber, which in turnwill be less dense than the air inthe outer chamber on the cool side of the instrument. There'- sult of this variance in temperature will be that the, diaphragm nearest the warmside of the casing will be'moved towards that side due to the heavier air in the middle chamber, while the swinging diaphragm nearest the coolest side of the casing will be moved towards the-warmer side. There will accordingly result a movement in opposite directions of the arms 24-;on the respective bars 21.

loosely mountedonthe arm 29,

nor mov ng it off the zero point. If at this casing, it is desirable to encase point flue gas is passed through the middle chamber, it will dispose both swinging partitions towards the outer sides, which will cause movement of the arms 26, 26, in the same direction, which reacting on the endsof the cross piece 30 would effect a move ment of'the arm 29 across the face of the chart, whilestill compensating for'any temperature difierence of the gases or'a'ir in the chambers, i 1 I As'still further assisting in the compensa tion or elimination of changes or variations due to differences in teinperature in the the latter in a casing of some heat-resisting "material,

I such as hair felt, magnesia, or other coverthe aforedescribed maner, it is also possible to get doublethe pow er applied to the recording pen than would be obtainedfroma double chamber and one side of I posite sides By using. three chambers andtwo swing-' ing partitions in swinging partition. -Obtaining double the;-

effective power in this-manner permits acon siderable reduction i'n-the size ofthe casing and a" more compact instrument. I claim: I

, I 1. In an nstrument for determininglithe a relativedensities of 'gases, thecombmation with an element movable under the elfectof' differential ga'spressures exerted. on opposite sidesthereoflof an indicator operative.

said indicator wherebythe accuracy of the ndicationsis relatively unafiected by variatons in the relative pressures of said gases 2. I In an instrument for determining the 'rel'ativedensities of gases, the combination with an element movable under the effect,

of differential gas pressures exerted on-;op1-

posite sides thereof, ofaninclicator opera tively connected with said eleinent,and compensating means including a thermosensitive element arranged-to be aflected by the ly connected with said element, and coinpensatingmeans operatively connected with I so due to changes in Y'the temperature of either of" said gases.

temperature of therespective gases and op-I.

eratively connected with the indicator so as to compensatingly affect the indications in accordance with the variations 'in-the pres sures of saidgases. due to the changes in temperature l 8.1111" an nst-ruinent -for determining the relative densities ofgasestthecombination witli' a n-Felem'ent inovable'under the "effect llmof differential} gas'pressures exerted on op- 'there0f, of1 an indicator lopjerat-i ely connectedwith said element, and compensating means includingat least two thermosensitive members arranged to be affected respectively by temperature changes in the gases and adapted to modify the operi I ative connection between the indicator and said element inacoo-rdance with temperature changes in the said gases whereby the indi-I cationsare compensated for variations in the relativepressures of said gases dueto said temperature changes; f I.

' 4. In an instrument for'determining the relative densities of gases, the combination with a'casingcomprising two gaschambers separated'by' a movable partition, of an 111- dicator operatively connected with said parthermosensitive element mounted within the casing and operat vely connected withcsaid' indicator so as to compensatingly affect the indications in accordance withvariations in I the relative pressuresofsaid gases due to temperature changesgp 7- a I 5; In an instrument-for determining the with 'acasing comprisingtwo. gas chambers ilicator operatively connectedfl with said casing,andcompensating means including a .tition, and compensating means includinga relative densities of gases,"the combination separated by a movable partition-,fof an'inv thermosensitive, element 1 mounted .within the casing and adapted to modify the operative. connection between the said partition and the indicator, in; accordance with temperature changes in said gases whereby the indications are compensated for variations in the relative pressures of saidgases due to said temperature changes.

I 6; In an instrument for determinin the relative densities of gases, the combination with a -casing comprising a movable partition, of means for subjectingsaid partition to the pressure effects of equal columns of gases on opposite-sides of the partition, an indicator operatively connected with said partition, and'at least one thermosensitive element mounted in the casing and operacompensatingly affect vthe indications inaccordance with variations in the'relative changes.

tively connected with the indicator so as to to temperature changesin one of said, gases.

8'- Iman instrument for determining the relative-densities of gases, the combination Withfan element 'movable'u'nder the effect of differential" gas pressures exerted on opposite sides thereof, of an indicator operatively connected with said element, and compensating means operatively connected with said indicator wherebyithe accuracy of the indications islrelatively unaffected by variations in the relative pressures ofsaid gases due to temperature, changes in both of said gases. 9. The combination of a casing having independent chambers separated by a movable partition, a movable element operatively connected with said partition and adapted to beactuated thereby, and a thermosensitive element arranged to be affected by the temperature in at least one of the chambers and controllingthe extent of movement of said element. Y

. r 10: In an instrument for determining the relative densities of gases, the combination 7 with a pair of elements movable under the effect .of the same differential gaspressures exerted on opposite sides thereof, of an indicator :operatively connected with both of saidv elements, and compensating means operatively connected with said indicator whereby the accuracy of the indications is rela- 't-ively unaffected by variations in'the relative pressures of said gases due to temperaturechanges. i v

'11. In an instrument for determiningthe relative densities of gases,- the combination with a pair of elements movable under the effect of the same differential gas pressures exerted on the respective opposite sides thereof, of an indicator operatively connected with both of said elements, andcompensating means operatively connected with said indicator whereby the accuracy of the indications is relatively unaffected by variationsin thevpressuresaof said gases due to differences of temperature of the respective gases.' a a. ,7 12. An instrument for determining the relative densities of gases comprising indicating means controlled by the relative pres: sures of equal columnsfof said gases, and thermosensitive means arranged to be affected by the temperature of at leastone of said gases'and associated with theiindieating means for "compensating for relative variations in thedensities of the gases at different temperatures. I

13. An instrument for determining the rela-tivedensities, of gases comprising indicating means controlled by the relative pressures-0fequal columns of' saidigases,and a thermosensitive element arranged to be affected by temperature changes inthe gase's and associated with the indicating means for compensating for the effect on said densities of different temperatures in the respective gases.

'14. An instrument for determining the relatives densities of gases comprising a freelyimovable member adapted to be subjected on opposite sides to'the pi'ressuresof equal columns of said gases, means controlled by the position of said member for indicating the relative pressures, and means operatively associated with the indicating means and with the gases for compensating for relative variations in'the pressures at different temperatures. a 1 r v .15. -An instrument for determining the relative densities of gases comprising a freely movable member adapted to be subjected on opposite sides to the pressures of equal columns of said gases, means controlled by the position of said member for accuracies due to relative yariation's in the pressures at different: temperatures?" I17:'An-'instrument for*determiningr-the. relative densitiesof ;gases :compr1s1ng a freely movable member adaptedl to b'e'sub- V je'cted o'n oppositesides to'thepressur'es of equal columnsf said gases, means controlled by'the position oi said'm'embe'r for indieating the relative pressures, and thermosensitive me'ansfin; each of said columns op I separating each adjoining pair of chambers,

meanstor indicating themovement of said partition due to a d tference of pressure within the chambers, .and thermosensltive means in the chambers controlling the operation of the indicating means, substantially as described. I

19. The combination of'a casing having.

' independent chambers separated by a movable partition, a'movable element operatively connected with saidpartition and adapted tobe actuated thereby, and a thermosensi- 'tive element in one of the chambers con trolling the extentof the movement of said element, substantially as described.

ing independent chambers separated by a movable partition, of an element operatively connecting the pointer arm with the partition, and a thermosensitive element in one of the chambers operatively connected 'with the said connecting element and adapted .by movement of the latter to control the movement of the pointer arm when actuatedby the partition.

21. An instrument comprising a casing, movable partitlons d viding said casing into three chambersfmeans for introducing gases to said chambers, an indicating instrument operatively associated with said partitions,

and means whereby equal movements ofthe partitions in the same direction have no eftect upon the indicating instrument;

- 22. An instrument comprising a casing,

' gmovable partitions dividing said casing into three chambers, means for introducing gases 7 to said'chambers, an indicating instrument I 'operatively associated with said partitions, and a thermosensitive compensating e1e-- ment operatively associated with each dia-' phragm. V Y

23. The combination with a substantially air-tight casing, of a plurality of movable partitions dividing the interior of the casing into equal chambers, an intake port in each chamber, a common exhaust means for the chambers, and ind cating means operatively connected with the partitions.

24:. The combinationwith a substantially ,perature changes.

27. In an instrumentfor determining the y i with an element movable under the effect-of l difierential gas pressures exerted on oppo airtight-casing, or a l ml i ty bf -movable: vpartitions dividing the interior of the lcase ing into equal :chamb'ers, an intake port 1n each-chamber, a common exhaust means for 25. In an instrument for determining the relative densities 1 of gases, the :combination with. an element movable underthe eiiect of differential gas pressures exerted on opposite 1 sides thereof, of an indicator operativelyj sating meansoperatively connected withsaid lndicator wherebv the accuracy of the indiconnected with said element, and compenj- I cations is relatively unafiectedby variationsf in the relative pressures'of said gases due to temperature changes.- 7

26. In an instrument for determining the relative densities of gases,j.the combination with an element movable under the effect of V differential gas pressures exerted on opp0-.

site sides thereof, of'an indicator operatively Y connected with said element,' and compen-.-

sating means including a thermosensitive element positioned so as to be affected by temperature changesin at least one of said gases and operatively connected with the in-v I no dications in accordance with variations in the 20. The combination with a casing havdicatorso as tocompensatingly aifect the inrelative pressuresof said gases due to tern relative densities of gases, the combination site sides thereof, of an indicator operatively connected with said element, and compen- V I sating means including as thermosensitive' element arranged to be affected by temperature changes in'thegases and operatively connected with theindicator so as to compensatingly afiect the-indications in accordance with variations in the. relative, pres-' sures V of said gases due to temperature changes.

28, In an instrumentfor determiningthe 1 I relative densities ofj'gases, the combination I with .an element movable underthe efiect of difl'erential gas pressures exertedon opposite sides thereof,- or" an indicator operatively connected with said element, and means for modlfyi'ng said 'operatlve connection in ac cordance with temperature" changes in said gases whereby theindications are compensated for variations in the relative pressures of said changes. v

29. In aninstrument for determining the relative densities of gases, the combination with a pair of movable elements arranged to be acted upon ontheir adjacent faces by the same column of gas and'on their outer faces by columns of another gas equal to the firstgases due to said temperature nameda.column,-'of an indicator operatively. connectedwith both of saidnelements, :and

' compensating means operatively connected with said indicator whereby the accuracy of the indications is 1 relatively-- unaffected by variations in the-pressures of said gases due to aidifi'erence of temperature in the columns.

e 30. In anlnstrument for determining the same. columnof gas and on their outer faces by columns of another gas equal to the firstnamed column, of an indioator operative'ly' connected with both of said elements, and compensating means including a thermoseir sltive elemen't located in'said outer Columns and operatively connected with the indicator so as to compensatingly affect the indications inaccordance With variations in pressuredue 20 to di iierent, temperatures inthe said columns.

f HOWARD M. 

